Di(4-aminophenyl)-methane (MDA): 4-7 year dog feeding study

Area of Science:

• Toxicology
• Veterinary Pathology
• Pharmacology

Background:

• 3,4-Methylenedioxymethamphetamine (MDA) is a psychoactive substance with known toxicological concerns.
• Limited data exists on the chronic effects of MDA ingestion in animal models, particularly regarding organ pathology.

Purpose of the Study:

• To evaluate the long-term toxicological effects of purified and crude MDA in pure-bred female beagles.
• To assess the impact of chronic MDA ingestion on various organs, including the liver, kidneys, and spleen, and to determine its carcinogenic potential.

Main Methods:

• Nine pure-bred female beagles were administered purified or crude MDA (70 mg doses, 3 times/week) for 3 years, 11 months to 7 years, 2 months.
• Dosage ranged from 39.98 g to 66.92 g/dog (approx. 4.0–6.26 g/kg body weight).
• Comprehensive gross and micropathological examinations of organs were conducted, alongside biochemical blood analyses.

Main Results:

• MDA ingestion resulted in occasional body weight loss with prompt recovery upon interruption of treatment.
• No significant effects were observed on blood sugar, BUN, creatinine, uric acid, total protein, or albumin. Alkaline phosphatase activity showed questionable changes.
• Moderate to severe gross and micropathological changes were evident in the liver, with less severe effects in the kidneys and spleen. Occasional changes were noted in other organs.
• No tumors of the urinary bladder or liver were observed.

Conclusions:

• Chronic MDA ingestion induces significant hepatic and renal histopathological changes in beagles.
• MDA does not appear to be carcinogenic in the urinary bladder or liver in this canine model.
• Further research is warranted to elucidate the specific mechanisms of MDA-induced organ toxicity.